Increasing buzzing i have a 150W 5.1 channel home theater system, and i turn it on, and after about 30-40 minutes it will start with a low buzz, and then it will get louder until you cant hear the music anymore, and i can turn it off, and turn it on again, and it will do the same thing

It looks like a dry or leaky capacitors in the power supply circuitry. Do a visual inspection on those big capacitors and pay attention for some bulging on top.
You should replace them to eliminate that buzzing noise.
Let me know if you need further assistance.

If there is too much electrical feed back coming from your earth, you can install a line level filter, or get an electrician to do it.

Or you can remove the earth pin on your subwoffer, and see resullt.If there is too much electrical feed back coming from your earth, you can install a line level filter, or get an electrician to do it.
Or you can remove the earth pin on your subwoffer, and see resullt.

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You need two more speakers to get surround sound,ie> two front one center and two for surround,then you need a home cinema amp to run the speakers and decode the sound from your tv,sky,dvd etc,and the sub gives you your bass.

You didn't say is your sub active or passive.If its active first check signal cables from theater system,power line of the sub, it has to be the same phase as the system.If its passive take a voltmeter disconnect the sub from the system and measure for DC voltage on the SUB output on the system when its OFF.If DC voltage is present your amp is damaged.It can also be that the preamp circuit for the sub doesn't mute the input when unit is on stand by and you hear frequency of your power supply (50-60Hz) on the sub